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What Alex has said is right on the money. RFID chips/tags only have a range of 6 inches or so. As soon as you're away from a reader, you're as anonymous as a person with an ID in their pocket. Even if someone walks around surreptitiously with a reader, if they don't have access to the database, all they have is your barcode number.
Every system has weaknesses and strengths. I'm sure none of us can imagine a time before photo ID, but it existed, and it had it's problems, even while people were freer in certain ways.
As for "I can leave my cell at home", yeah, you can, but do you? Would you? I think it would take a mass misuse of the locator technology for me to actually give up owning a cell phone, and I don't see it getting to that point. If it did, I'd have to move to a different country. Cell phones and other similar devices have already become mostly indispensible...almost as if they're attached to your arm.
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